Versions of Iowa Code 232.1 - Rules of construction on LawServer 2023 Iowa Code 232.1 – Rules of construction 2022 Iowa Code 232.1 – Rules of construction 2020 Iowa Code 232.1 – Rules of construction 2018 Iowa Code 232.1 – Rules of construction 2016 Iowa Code 232.1 – Rules of construction 2014 Iowa Code 232.1 – Rules of construction. 2009 Iowa Code 232.1 – Rules of construction